3. Economics: Pleasure or satisfaction (value for money) derived by a person from the consumption of a good or service or from being in a particular place, and for the maximization of which all economic actions are motivated. It is the subjective or psychic return which cannot be measured in absolute or objective terms. Goods or services that have utility for one person may not have for another, and what may have utility for a person at a certain time or place may not have it at another. See also utility theory.

4. Ethics: As described by the English philosopher-reformer Jeremy Bentham (1748-1832), what appears to "augment or diminish the happiness of the party whose interest is in question."

5.Patent law: Usefulness of the item for which a patent is applied. An invention must be capable of use and must perform some useful function for to be considered patentable.